Multi-stage magnetic switch

Abstract

A multi-stage magnetic switch includes a base and a rotary member rotatably held in the base. The base holds a latch member elastically extended outwards. The rotary member includes a plurality of latch notches. Each latch notch has a latch plane and an arched convex surface which have respectively one side extended to the outer surface of the rotary member. The latch member latches on the latch plane and is adjacent to the arched convex surface. The latch member is pressed and retracted through the latch plane when the rotary member rotates against the base so that the latch member latches on the latch notches sequentially to form multi-stage positioning. Moreover, greater force can be applied to retract the latch member pressed by the arched convex surface to reverse the rotary member. The switch of the invention thus formed has simple structure and makes multi-stage positioning easier.

1 . A multi-stage magnetic switch, comprising:
 a base including a bore and a latch groove adjacent to a side wall of the bore to hold a latch member elastically extended outside the latch groove; and   a rotary member which is rotatably held in the bore and includes a plurality of latch notches corresponding to and latched with the latch member, each latch notch including a latch plane and an arched convex surface that include respectively one side extended to the outer surface of the rotary member, the latch member being latched on the latch plane and abutting the arched convex surface.   
     
     
         2 . The multi-stage magnetic switch of  claim 1 , wherein the latch member includes a spring latched in the latch groove and a strut to press the spring in the latch groove. 
     
     
         3 . The multi-stage magnetic switch of  claim 2 , wherein the strut includes a cavity to hold the spring. 
     
     
         4 . The multi-stage magnetic switch of  claim 1 , wherein the latch groove and the latch member include respectively multiple sets, the multiple latch members being latched on the latch notches sequentially when the rotary member rotates against the base. 
     
     
         5 . The multi-stage magnetic switch of  claim 4 , wherein the latch members latch on the latch notches simultaneously. 
     
     
         6 . The multi-stage magnetic switch of  claim 1 , wherein the base is fastened to a magnetic holder which includes a housing space, the rotary member including an aperture run through by a shaft which is held in the housing space and includes a latch flange to allow the rotary member to rotatably hinge on the base.